Assigning property to a string variable in javascript [duplicate]

Question

Following is the javascript code which is returning undefined but didn't get why Javascript being loosely typed language is returning undefinedhere. What is going on under the hood in memory ?

var myVar = "My String";

myVar.name = "Test"; 

console.log(myVar.name);

Snow · Accepted Answer · 2021-01-26 20:20:27Z

5

Primitives can't have properties. Your assignment is silently failing. Use strict mode to make the error visible.

'use strict';
var myVar = "My String";

myVar.name = "Test"; 

console.log(myVar.name);

Uncaught TypeError: Cannot create property 'name' on string 'My String'

MDN has a big section on how strict mode can convert mistakes into errors.

edited Jan 26, 2021 at 20:20

answered Jan 26, 2021 at 20:00

Snow

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1 Comment

axiac Over a year ago

A good answer that can become even better if you can add a link to an official documentation page that backs up your statement.

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